Flat Holm (Welsh: Ynys Echni) is a limestone island lying in the Bristol Channel approximately 6 km (4 mi) from Lavernock Point in Glamorgan. It includes the most southerly point of Wales.
The island has a long history of occupation, dating at least from Anglo-Saxon and Viking periods. Religious uses include visits by disciples of Saint Cadoc in the 6th century, and in...